Solution structure of the catalytic domain of GCN5 histone acetyltransferase bound to coenzyme A

Yingxi Lin, C. Mark Fletcher, Jianxin Zhou, C. David Allis and Gerhard Wagner ()
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Yingxi Lin: Harvard Medical School
C. Mark Fletcher: Harvard Medical School
Jianxin Zhou: University of Virginia
C. David Allis: University of Virginia
Gerhard Wagner: Harvard Medical School

Nature, 1999, vol. 400, issue 6739, 86-89

Abstract: Abstract Gene transcription requires the release of inactive DNA from its packaging of histone proteins. Following the discovery of the first transcription-associated histone acetyltransferase, tetrahymena GCN51, it was shown that yeast GCN5 is recruited to the promoter and causes hyper-acetylation of histones and transcriptional activation of target genes2,3, establishing a direct connection between histone acetylation and transcriptional activation. Many other important transcription regulators have been found to have histone acetyltransferase activity, including TAFii230/250, p300/CBP and its associated factor PCAF4,5,6,7,8,9. Here we present the solution structure of the catalytic domain of tGCN5 (residues 47–210) in complex with coenzyme A. The structure contains two domains; the amino-terminal domain is similar to those of other GCN5-related N-acetyltransferases10,11 but the carboxy-terminal domain is not. Coenzyme A binds in a deep hydrophobic pocket between the two domains. Chemical shift changes upon titration with histone H3 peptides indicate a binding site at the domain boundary opposite to the coenzyme A site. The structural data indicate a single-step acetyl-transfer reaction mechanism catalysed by a hydrogen bond to the backbone amide group of leucine 126 and the side-chain carboxyl group of a conserved acidic residue.

Date: 1999
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DOI: 10.1038/21922

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